<?php

class grad
{
    public $mpdf = null;

    public function grad(&$mpdf)
    {
        $this->mpdf = $mpdf;
    }

    // mPDF 5.3.A1
    public function CoonsPatchMesh($x, $y, $w, $h, $patch_array=array(), $x_min=0, $x_max=1, $y_min=0, $y_max=1, $colspace='RGB', $return=false)
    {
        $s=' q ';
        $s.=sprintf(' %.3F %.3F %.3F %.3F re W n ', $x*_MPDFK, ($this->mpdf->h-$y)*_MPDFK, $w*_MPDFK, -$h*_MPDFK);
        $s.=sprintf(' %.3F 0 0 %.3F %.3F %.3F cm ', $w*_MPDFK, $h*_MPDFK, $x*_MPDFK, ($this->mpdf->h-($y+$h))*_MPDFK);
        $n = count($this->mpdf->gradients)+1;
        $this->mpdf->gradients[$n]['type'] = 6; //coons patch mesh
    $this->mpdf->gradients[$n]['colorspace'] = $colspace; //coons patch mesh
    $bpcd=65535; //16 BitsPerCoordinate
    $trans = false;
        $this->mpdf->gradients[$n]['stream']='';
        for ($i=0;$i<count($patch_array);$i++) {
            $this->mpdf->gradients[$n]['stream'].=chr($patch_array[$i]['f']); //start with the edge flag as 8 bit
            for ($j=0;$j<count($patch_array[$i]['points']);$j++) {
                //each point as 16 bit
            if (($j % 2) == 1) {	// Y coordinate (adjusted as input is From top left)
                $patch_array[$i]['points'][$j]=(($patch_array[$i]['points'][$j]-$y_min)/($y_max-$y_min))*$bpcd;
                $patch_array[$i]['points'][$j]=$bpcd-$patch_array[$i]['points'][$j];
            } else {
                $patch_array[$i]['points'][$j]=(($patch_array[$i]['points'][$j]-$x_min)/($x_max-$x_min))*$bpcd;
            }
                if ($patch_array[$i]['points'][$j]<0) {
                    $patch_array[$i]['points'][$j]=0;
                }
                if ($patch_array[$i]['points'][$j]>$bpcd) {
                    $patch_array[$i]['points'][$j]=$bpcd;
                }
                $this->mpdf->gradients[$n]['stream'].=chr(floor($patch_array[$i]['points'][$j]/256));
                $this->mpdf->gradients[$n]['stream'].=chr(floor($patch_array[$i]['points'][$j]%256));
            }
            for ($j=0;$j<count($patch_array[$i]['colors']);$j++) {
                //each color component as 8 bit
                if ($colspace=='RGB') {
                    $this->mpdf->gradients[$n]['stream'].=($patch_array[$i]['colors'][$j][1]);
                    $this->mpdf->gradients[$n]['stream'].=($patch_array[$i]['colors'][$j][2]);
                    $this->mpdf->gradients[$n]['stream'].=($patch_array[$i]['colors'][$j][3]);
                    if (isset($patch_array[$i]['colors'][$j][4]) && ord($patch_array[$i]['colors'][$j][4])<100) {
                        $trans = true;
                    }
                } elseif ($colspace=='CMYK') {
                    $this->mpdf->gradients[$n]['stream'].=chr(ord($patch_array[$i]['colors'][$j][1])*2.55);
                    $this->mpdf->gradients[$n]['stream'].=chr(ord($patch_array[$i]['colors'][$j][2])*2.55);
                    $this->mpdf->gradients[$n]['stream'].=chr(ord($patch_array[$i]['colors'][$j][3])*2.55);
                    $this->mpdf->gradients[$n]['stream'].=chr(ord($patch_array[$i]['colors'][$j][4])*2.55);
                    if (isset($patch_array[$i]['colors'][$j][5]) && ord($patch_array[$i]['colors'][$j][5])<100) {
                        $trans = true;
                    }
                } elseif ($colspace=='Gray') {
                    $this->mpdf->gradients[$n]['stream'].=($patch_array[$i]['colors'][$j][1]);
                    if ($patch_array[$i]['colors'][$j][2]==1) {
                        $trans = true;
                    }	// transparency converted from rgba or cmyka()
                }
            }
        }
        // TRANSPARENCY
        if ($trans) {
            $this->mpdf->gradients[$n]['stream_trans']='';
            for ($i=0;$i<count($patch_array);$i++) {
                $this->mpdf->gradients[$n]['stream_trans'].=chr($patch_array[$i]['f']);
                for ($j=0;$j<count($patch_array[$i]['points']);$j++) {
                    //each point as 16 bit
                    $this->mpdf->gradients[$n]['stream_trans'].=chr(floor($patch_array[$i]['points'][$j]/256));
                    $this->mpdf->gradients[$n]['stream_trans'].=chr(floor($patch_array[$i]['points'][$j]%256));
                }
                for ($j=0;$j<count($patch_array[$i]['colors']);$j++) {
                    //each color component as 8 bit // OPACITY
                    if ($colspace=='RGB') {
                        $this->mpdf->gradients[$n]['stream_trans'].=chr((int)(ord($patch_array[$i]['colors'][$j][4]) * 2.55));
                    } elseif ($colspace=='CMYK') {
                        $this->mpdf->gradients[$n]['stream_trans'].=chr((int)(ord($patch_array[$i]['colors'][$j][5]) * 2.55));
                    } elseif ($colspace=='Gray') {
                        $this->mpdf->gradients[$n]['stream_trans'].=chr((int)(ord($patch_array[$i]['colors'][$j][3]) * 2.55));
                    }
                }
            }
            $this->mpdf->gradients[$n]['trans'] = true;
            $s .= ' /TGS'.$n.' gs ';
        }
        //paint the gradient
        $s .= '/Sh'.$n.' sh'."\n";
        //restore previous Graphic State
        $s .= 'Q'."\n";
        if ($return) {
            return $s;
        } else {
            $this->mpdf->_out($s);
        }
    }


    // type = linear:2; radial: 3;
    // Linear: $coords - array of the form (x1, y1, x2, y2) which defines the gradient vector (see linear_gradient_coords.jpg).
//    The default value is from left to right (x1=0, y1=0, x2=1, y2=0).
    // Radial: $coords - array of the form (fx, fy, cx, cy, r) where (fx, fy) is the starting point of the gradient with color1,
//    (cx, cy) is the center of the circle with color2, and r is the radius of the circle (see radial_gradient_coords.jpg).
//    (fx, fy) should be inside the circle, otherwise some areas will not be defined
    // $col = array(R,G,B/255); or array(G/255); or array(C,M,Y,K/100)
    // $stops = array('col'=>$col [, 'opacity'=>0-1] [, 'offset'=>0-1])
    public function Gradient($x, $y, $w, $h, $type, $stops=array(), $colorspace='RGB', $coords='', $extend='', $return=false, $is_mask=false)
    {
        if (strtoupper(substr($type, 0, 1)) == 'L') {
            $type = 2;
        }	// linear
    elseif (strtoupper(substr($type, 0, 1)) == 'R') {
        $type = 3;
    }	// radial
    if ($colorspace != 'CMYK' && $colorspace != 'Gray') {
        $colorspace = 'RGB';
    }
        $bboxw = $w;
        $bboxh = $h;
        $usex = $x;
        $usey = $y;
        $usew = $bboxw;
        $useh = $bboxh;
        if ($type < 1) {
            $type = 2;
        }
        if ($coords[0]!==false && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i', $coords[0], $m)) {
            $tmp = $this->mpdf->ConvertSize($m[1], $this->mpdf->w, $this->mpdf->FontSize, false);
            if ($tmp) {
                $coords[0] = $tmp/$w;
            }
        }
        if ($coords[1]!==false && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i', $coords[1], $m)) {
            $tmp = $this->mpdf->ConvertSize($m[1], $this->mpdf->w, $this->mpdf->FontSize, false);
            if ($tmp) {
                $coords[1] = 1-($tmp/$h);
            }
        }
        // LINEAR
        if ($type == 2) {
            $angle = $coords[4];
            $repeat = $coords[5];
            // ALL POINTS SET (default for custom mPDF linear gradient) - no -moz
            if ($coords[0]!==false && $coords[1]!==false && $coords[2]!==false && $coords[3]!==false) {
                // do nothing - coords used as they are
            }

            // If both a <point> and <angle> are defined, the gradient axis starts from the point and runs along the angle. The end point is
            // defined as before - in this case start points may not be in corners, and axis may not correctly fall in the right quadrant.
            // NO end points (Angle defined & Start points)
            elseif ($angle!==false && $coords[0]!==false && $coords[1]!==false && $coords[2]===false && $coords[3]===false) {
                if ($angle==0 || $angle==360) {
                    $coords[3]=$coords[1];
                    if ($coords[0]==1) {
                        $coords[2]=2;
                    } else {
                        $coords[2]=1;
                    }
                } elseif ($angle==90) {
                    $coords[2]=$coords[0];
                    $coords[3]=1;
                    if ($coords[1]==1) {
                        $coords[3]=2;
                    } else {
                        $coords[3]=1;
                    }
                } elseif ($angle==180) {
                    if ($coords[4]==0) {
                        $coords[2]=-1;
                    } else {
                        $coords[2]=0;
                    }
                    $coords[3]=$coords[1];
                } elseif ($angle==270) {
                    $coords[2]=$coords[0];
                    if ($coords[1]==0) {
                        $coords[3]=-1;
                    } else {
                        $coords[3]=0;
                    }
                } else {
                    $endx=1;
                    $endy=1;
                    if ($angle <=90) {
                        if ($angle <=45) {
                            $endy=tan(deg2rad($angle));
                        } else {
                            $endx=tan(deg2rad(90-$angle));
                        }
                        $b = atan2(($endy*$bboxh), ($endx*$bboxw));
                        $ny = 1 - $coords[1] - (tan($b) * (1-$coords[0]));
                        $tx = sin($b) * cos($b) * $ny;
                        $ty = cos($b) * cos($b) * $ny;
                        $coords[2] = 1+$tx;
                        $coords[3] = 1-$ty;
                    } elseif ($angle <=180) {
                        if ($angle <=135) {
                            $endx=tan(deg2rad($angle-90));
                        } else {
                            $endy=tan(deg2rad(180-$angle));
                        }
                        $b = atan2(($endy*$bboxh), ($endx*$bboxw));
                        $ny = 1 - $coords[1] - (tan($b) * ($coords[0]));
                        $tx = sin($b) * cos($b) * $ny;
                        $ty = cos($b) * cos($b) * $ny;
                        $coords[2] =  -$tx;
                        $coords[3] = 1-$ty;
                    } elseif ($angle <=270) {
                        if ($angle <=225) {
                            $endy=tan(deg2rad($angle-180));
                        } else {
                            $endx=tan(deg2rad(270-$angle));
                        }
                        $b = atan2(($endy*$bboxh), ($endx*$bboxw));
                        $ny = $coords[1] - (tan($b) * ($coords[0]));
                        $tx = sin($b) * cos($b) * $ny;
                        $ty = cos($b) * cos($b) * $ny;
                        $coords[2] = -$tx;
                        $coords[3] = $ty;
                    } else {
                        if ($angle <=315) {
                            $endx=tan(deg2rad($angle-270));
                        } else {
                            $endy=tan(deg2rad(360-$angle));
                        }
                        $b = atan2(($endy*$bboxh), ($endx*$bboxw));
                        $ny = $coords[1] - (tan($b) * (1-$coords[0]));
                        $tx = sin($b) * cos($b) * $ny;
                        $ty = cos($b) * cos($b) * $ny;
                        $coords[2] = 1+$tx;
                        $coords[3] = $ty;
                    }
                }
            }

            // -moz If the first parameter is only an <angle>, the gradient axis starts from the box's corner that would ensure the
            // axis goes through the box. The axis runs along the specified angle. The end point of the axis is defined such that the
            // farthest corner of the box from the starting point is perpendicular to the gradient axis at that point.
            // NO end points or Start points (Angle defined)
            elseif ($angle!==false && $coords[0]===false && $coords[1]===false) {
                if ($angle==0 || $angle==360) {
                    $coords[0]=0;
                    $coords[1]=0;
                    $coords[2]=1;
                    $coords[3]=0;
                } elseif ($angle==90) {
                    $coords[0]=0;
                    $coords[1]=0;
                    $coords[2]=0;
                    $coords[3]=1;
                } elseif ($angle==180) {
                    $coords[0]=1;
                    $coords[1]=0;
                    $coords[2]=0;
                    $coords[3]=0;
                } elseif ($angle==270) {
                    $coords[0]=0;
                    $coords[1]=1;
                    $coords[2]=0;
                    $coords[3]=0;
                } else {
                    if ($angle <=90) {
                        $coords[0]=0;
                        $coords[1]=0;
                        if ($angle <=45) {
                            $endx=1;
                            $endy=tan(deg2rad($angle));
                        } else {
                            $endx=tan(deg2rad(90-$angle));
                            $endy=1;
                        }
                    } elseif ($angle <=180) {
                        $coords[0]=1;
                        $coords[1]=0;
                        if ($angle <=135) {
                            $endx=tan(deg2rad($angle-90));
                            $endy=1;
                        } else {
                            $endx=1;
                            $endy=tan(deg2rad(180-$angle));
                        }
                    } elseif ($angle <=270) {
                        $coords[0]=1;
                        $coords[1]=1;
                        if ($angle <=225) {
                            $endx=1;
                            $endy=tan(deg2rad($angle-180));
                        } else {
                            $endx=tan(deg2rad(270-$angle));
                            $endy=1;
                        }
                    } else {
                        $coords[0]=0;
                        $coords[1]=1;
                        if ($angle <=315) {
                            $endx=tan(deg2rad($angle-270));
                            $endy=1;
                        } else {
                            $endx=1;
                            $endy=tan(deg2rad(360-$angle));
                        }
                    }
                    $b = atan2(($endy*$bboxh), ($endx*$bboxw));
                    $h2 = $bboxh - ($bboxh * tan($b));
                    $px = $bboxh + ($h2 * sin($b) * cos($b));
                    $py = ($bboxh * tan($b)) + ($h2 * sin($b) * sin($b));
                    $x1 = $px / $bboxh;
                    $y1 = $py / $bboxh;
                    if ($angle <=90) {
                        $coords[2] = $x1;
                        $coords[3] = $y1;
                    } elseif ($angle <=180) {
                        $coords[2] = 1-$x1;
                        $coords[3] = $y1;
                    } elseif ($angle <=270) {
                        $coords[2] = 1-$x1;
                        $coords[3] = 1-$y1;
                    } else {
                        $coords[2] = $x1;
                        $coords[3] = 1-$y1;
                    }
                }
            }
            // -moz If the first parameter to the gradient function is only a <point>, the gradient axis starts from the specified point,
        // and ends at the point you would get if you rotated the starting point by 180 degrees about the center of the box that the
        // gradient is to be applied to.
        // NO angle and NO end points (Start points defined)
        elseif ((!isset($angle) || $angle===false) && $coords[0]!==false && $coords[1]!==false) { 	// should have start and end defined
          $coords[2] = 1-$coords[0];
            $coords[3] = 1-$coords[1];
            $angle = rad2deg(atan2($coords[3]-$coords[1], $coords[2]-$coords[0]));
            if ($angle < 0) {
                $angle += 360;
            } elseif ($angle > 360) {
                $angle -= 360;
            }
            if ($angle!=0 && $angle!=360 && $angle!=90 && $angle!=180 && $angle!=270) {
                if ($w >= $h) {
                    $coords[1] *= $h/$w ;
                    $coords[3] *= $h/$w ;
                    $usew = $useh = $bboxw;
                    $usey -= ($w-$h);
                } else {
                    $coords[0] *= $w/$h ;
                    $coords[2] *= $w/$h ;
                    $usew = $useh = $bboxh;
                }
            }
        }

            // -moz If neither a <point> or <angle> is specified, i.e. the entire function consists of only <stop> values, the gradient
        // axis starts from the top of the box and runs vertically downwards, ending at the bottom of the box.
        else {	// default values T2B
            // All values are set in parseMozGradient - so won't appear here
            $coords = array(0,0,1,0);	// default for original linear gradient (L2R)
        }
            $s = ' q';
            $s .= sprintf(' %.3F %.3F %.3F %.3F re W n', $x*_MPDFK, ($this->mpdf->h-$y)*_MPDFK, $w*_MPDFK, -$h*_MPDFK)."\n";
            $s .= sprintf(' %.3F 0 0 %.3F %.3F %.3F cm', $usew*_MPDFK, $useh*_MPDFK, $usex*_MPDFK, ($this->mpdf->h-($usey+$useh))*_MPDFK)."\n";
        }

        // RADIAL
        elseif ($type == 3) {
            $radius = $coords[4];
            $angle = $coords[5];	// ?? no effect
            $shape = $coords[6];
            $size = $coords[7];
            $repeat = $coords[8];
            // ALL POINTS AND RADIUS SET (default for custom mPDF radial gradient) - no -moz
            if ($coords[0]!==false && $coords[1]!==false && $coords[2]!==false && $coords[3]!==false && $coords[4]!==false) {
                // do nothing - coords used as they are
            }
            // If a <point> is defined
            elseif ($shape!==false && $size!==false) {
                if ($coords[2]==false) {
                    $coords[2] = $coords[0];
                }
                if ($coords[3]==false) {
                    $coords[3] = $coords[1];
                }
                // ELLIPSE
                if ($shape=='ellipse') {
                    $corner1 = sqrt(pow($coords[0], 2) + pow($coords[1], 2));
                    $corner2 = sqrt(pow($coords[0], 2) + pow((1-$coords[1]), 2));
                    $corner3 = sqrt(pow((1-$coords[0]), 2) + pow($coords[1], 2));
                    $corner4 = sqrt(pow((1-$coords[0]), 2) + pow((1-$coords[1]), 2));
                    if ($size=='closest-side') {
                        $radius = min($coords[0], $coords[1], (1-$coords[0]), (1-$coords[1]));
                    } elseif ($size=='closest-corner') {
                        $radius = min($corner1, $corner2, $corner3, $corner4);
                    } elseif ($size=='farthest-side') {
                        $radius = max($coords[0], $coords[1], (1-$coords[0]), (1-$coords[1]));
                    } else {
                        $radius = max($corner1, $corner2, $corner3, $corner4);
                    }	// farthest corner (default)
                }
                // CIRCLE
                elseif ($shape=='circle') {
                    if ($w >= $h) {
                        $coords[1] = $coords[3] = ($coords[1] * $h/$w) ;
                        $corner1 = sqrt(pow($coords[0], 2) + pow($coords[1], 2));
                        $corner2 = sqrt(pow($coords[0], 2) + pow((($h/$w)-$coords[1]), 2));
                        $corner3 = sqrt(pow((1-$coords[0]), 2) + pow($coords[1], 2));
                        $corner4 = sqrt(pow((1-$coords[0]), 2) + pow((($h/$w)-$coords[1]), 2));
                        if ($size=='closest-side') {
                            $radius = min($coords[0], $coords[1], (1-$coords[0]), (($h/$w)-$coords[1]));
                        } elseif ($size=='closest-corner') {
                            $radius = min($corner1, $corner2, $corner3, $corner4);
                        } elseif ($size=='farthest-side') {
                            $radius = max($coords[0], $coords[1], (1-$coords[0]), (($h/$w)-$coords[1]));
                        } elseif ($size=='farthest-corner') {
                            $radius = max($corner1, $corner2, $corner3, $corner4);
                        }	// farthest corner (default)
                        $usew = $useh = $bboxw;
                        $usey -= ($w-$h);
                    } else {
                        $coords[0] = $coords[2] = ($coords[0] * $w/$h) ;
                        $corner1 = sqrt(pow($coords[0], 2) + pow($coords[1], 2));
                        $corner2 = sqrt(pow($coords[0], 2) + pow((1-$coords[1]), 2));
                        $corner3 = sqrt(pow((($w/$h)-$coords[0]), 2) + pow($coords[1], 2));
                        $corner4 = sqrt(pow((($w/$h)-$coords[0]), 2) + pow((1-$coords[1]), 2));
                        if ($size=='closest-side') {
                            $radius = min($coords[0], $coords[1], (($w/$h)-$coords[0]), (1-$coords[1]));
                        } elseif ($size=='closest-corner') {
                            $radius = min($corner1, $corner2, $corner3, $corner4);
                        } elseif ($size=='farthest-side') {
                            $radius = max($coords[0], $coords[1], (($w/$h)-$coords[0]), (1-$coords[1]));
                        } elseif ($size=='farthest-corner') {
                            $radius = max($corner1, $corner2, $corner3, $corner4);
                        }	// farthest corner (default)
                        $usew = $useh = $bboxh;
                    }
                }
                if ($radius==0) {
                    $radius=0.001;
                }	// to prevent error
                $coords[4] = $radius;
            }

            // -moz If entire function consists of only <stop> values
        else {	// default values
            // All values are set in parseMozGradient - so won't appear here
            $coords = array(0.5,0.5,0.5,0.5);	// default for radial gradient (centred)
        }
            $s = ' q';
            $s .= sprintf(' %.3F %.3F %.3F %.3F re W n', $x*_MPDFK, ($this->mpdf->h-$y)*_MPDFK, $w*_MPDFK, -$h*_MPDFK)."\n";
            $s .= sprintf(' %.3F 0 0 %.3F %.3F %.3F cm', $usew*_MPDFK, $useh*_MPDFK, $usex*_MPDFK, ($this->mpdf->h-($usey+$useh))*_MPDFK)."\n";
        }

        $n = count($this->mpdf->gradients) + 1;
        $this->mpdf->gradients[$n]['type'] = $type;
        $this->mpdf->gradients[$n]['colorspace'] = $colorspace;
        $trans = false;
        $this->mpdf->gradients[$n]['is_mask'] = $is_mask;
        if ($is_mask) {
            $trans = true;
        }
        if (count($stops) == 1) {
            $stops[1] = $stops[0];
        }
        if (!isset($stops[0]['offset'])) {
            $stops[0]['offset'] = 0;
        }
        if (!isset($stops[(count($stops)-1)]['offset'])) {
            $stops[(count($stops)-1)]['offset'] = 1;
        }

        // Fix stop-offsets set as absolute lengths
        if ($type==2) {
            $axisx = ($coords[2]-$coords[0])*$usew;
            $axisy = ($coords[3]-$coords[1])*$useh;
            $axis_length = sqrt(pow($axisx, 2) + pow($axisy, 2));
        } else {
            $axis_length = $coords[4]*$usew;
        }	// Absolute lengths are meaningless for an ellipse - Firefox uses Width as reference

        for ($i=0;$i<count($stops);$i++) {
            if (isset($stops[$i]['offset']) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i', $stops[$i]['offset'], $m)) {
                $tmp = $this->mpdf->ConvertSize($m[1], $this->mpdf->w, $this->mpdf->FontSize, false);
                $stops[$i]['offset'] = $tmp/$axis_length;
            }
        }


        if (isset($stops[0]['offset']) && $stops[0]['offset']>0) {
            $firststop = $stops[0];
            $firststop['offset'] = 0;
            array_unshift($stops, $firststop);
        }
        if (!$repeat && isset($stops[(count($stops)-1)]['offset']) && $stops[(count($stops)-1)]['offset']<1) {
            $endstop = $stops[(count($stops)-1)];
            $endstop['offset'] = 1;
            $stops[] = $endstop;
        }
        if ($stops[0]['offset'] > $stops[(count($stops)-1)]['offset']) {
            $stops[0]['offset'] = 0;
            $stops[(count($stops)-1)]['offset'] = 1;
        }

        for ($i=0;$i<count($stops);$i++) {
            // mPDF 5.3.74
            if ($colorspace == 'CMYK') {
                $this->mpdf->gradients[$n]['stops'][$i]['col'] = sprintf('%.3F %.3F %.3F %.3F', (ord($stops[$i]['col']{1})/100), (ord($stops[$i]['col']{2})/100), (ord($stops[$i]['col']{3})/100), (ord($stops[$i]['col']{4})/100));
            } elseif ($colorspace == 'Gray') {
                $this->mpdf->gradients[$n]['stops'][$i]['col'] = sprintf('%.3F', (ord($stops[$i]['col']{1})/255));
            } else {
                $this->mpdf->gradients[$n]['stops'][$i]['col'] = sprintf('%.3F %.3F %.3F', (ord($stops[$i]['col']{1})/255), (ord($stops[$i]['col']{2})/255), (ord($stops[$i]['col']{3})/255));
            }
            if (!isset($stops[$i]['opacity'])) {
                $stops[$i]['opacity'] = 1;
            } elseif ($stops[$i]['opacity'] > 1 || $stops[$i]['opacity'] < 0) {
                $stops[$i]['opacity'] = 1;
            } elseif ($stops[$i]['opacity'] < 1) {
                $trans = true;
            }
            $this->mpdf->gradients[$n]['stops'][$i]['opacity'] = $stops[$i]['opacity'];
            // OFFSET
            if ($i>0 && $i<(count($stops)-1)) {
                if (!isset($stops[$i]['offset']) || (isset($stops[$i+1]['offset']) && $stops[$i]['offset']>$stops[$i+1]['offset']) || $stops[$i]['offset']<$stops[$i-1]['offset']) {
                    if (isset($stops[$i-1]['offset']) && isset($stops[$i+1]['offset'])) {
                        $stops[$i]['offset'] = ($stops[$i-1]['offset']+$stops[$i+1]['offset'])/2;
                    } else {
                        for ($j=($i+1);$j<count($stops);$j++) {
                            if (isset($stops[$j]['offset'])) {
                                break;
                            }
                        }
                        $int = ($stops[$j]['offset'] - $stops[($i-1)]['offset'])/($j-$i+1);
                        for ($f=0;$f<($j-$i-1);$f++) {
                            $stops[($i+$f)]['offset'] = $stops[($i+$f-1)]['offset'] + ($int);
                        }
                    }
                }
            }
            $this->mpdf->gradients[$n]['stops'][$i]['offset'] = $stops[$i]['offset'];
            $this->mpdf->gradients[$n]['stops'][$i]['offset'] = $stops[$i]['offset'];
        }

        if ($repeat) {
            $ns = count($this->mpdf->gradients[$n]['stops']);
            $offs = array();
            for ($i=0;$i<$ns;$i++) {
                $offs[$i] = $this->mpdf->gradients[$n]['stops'][$i]['offset'];
            }
            $gp = 0;
            $inside=true;
            while ($inside) {
                $gp++;
                for ($i=0;$i<$ns;$i++) {
                    $this->mpdf->gradients[$n]['stops'][(($ns*$gp)+$i)] = $this->mpdf->gradients[$n]['stops'][(($ns*($gp-1))+$i)];
                    $tmp = $this->mpdf->gradients[$n]['stops'][(($ns*($gp-1))+($ns-1))]['offset']+$offs[$i] ;
                    if ($tmp < 1) {
                        $this->mpdf->gradients[$n]['stops'][(($ns*$gp)+$i)]['offset'] = $tmp;
                    } else {
                        $this->mpdf->gradients[$n]['stops'][(($ns*$gp)+$i)]['offset'] = 1;
                        $inside = false;
                        break(2);
                    }
                }
            }
        }

        if ($trans) {
            $this->mpdf->gradients[$n]['trans'] = true;
            $s .= ' /TGS'.$n.' gs ';
        }
        if (!is_array($extend) || count($extend) <1) {
            $extend=array('true', 'true');	// These are supposed to be quoted - appear in PDF file as text
        }
        $this->mpdf->gradients[$n]['coords'] = $coords;
        $this->mpdf->gradients[$n]['extend'] = $extend;
        //paint the gradient
        $s .= '/Sh'.$n.' sh '."\n";
        //restore previous Graphic State
        $s .= ' Q '."\n";
        if ($return) {
            return $s;
        } else {
            $this->mpdf->_out($s);
        }
    }


    public function parseMozGradient($bg)
    {
        //	background[-image]: -moz-linear-gradient(left, #c7Fdde 20%, #FF0000 );
        //	background[-image]: linear-gradient(left, #c7Fdde 20%, #FF0000 ); // CSS3
        if (preg_match('/repeating-/', $bg)) {
            $repeat = true;
        } else {
            $repeat = false;
        }
        if (preg_match('/linear-gradient\((.*)\)/', $bg, $m)) {
            $g = array();
            $g['type'] = 2;
            $g['colorspace'] = 'RGB';
            $g['extend'] = array('true','true');
            $v = trim($m[1]);
            // Change commas inside e.g. rgb(x,x,x)
            while (preg_match('/(\([^\)]*?),/', $v)) {
                $v = preg_replace('/(\([^\)]*?),/', '\\1@', $v);
            }
            // Remove spaces inside e.g. rgb(x, x, x)
            while (preg_match('/(\([^\)]*?)[ ]/', $v)) {
                $v = preg_replace('/(\([^\)]*?)[ ]/', '\\1', $v);
            }
            $bgr = preg_split('/\s*,\s*/', $v);
            for ($i=0;$i<count($bgr);$i++) {
                $bgr[$i] = preg_replace('/@/', ',', $bgr[$i]);
            }
            // Is first part $bgr[0] a valid point/angle?
            $first = preg_split('/\s+/', trim($bgr[0]));
            if (preg_match('/(left|center|right|bottom|top|deg|grad|rad)/i', $bgr[0]) && !preg_match('/(<#|rgb|rgba|hsl|hsla)/i', $bgr[0])) {
                $startStops = 1;
            } elseif (trim($first[(count($first)-1)]) === "0") {
                $startStops = 1;
            } else {
                $check = $this->mpdf->ConvertColor($first[0]);
                if ($check) {
                    $startStops = 0;
                } else {
                    $startStops = 1;
                }
            }
            // first part a valid point/angle?
    if ($startStops == 1) {	// default values
        // [<point> || <angle>,] = [<% em px left center right bottom top> || <deg grad rad 0>,]
        if (preg_match('/([\-]*[0-9\.]+)(deg|grad|rad)/i', $bgr[0], $m)) {
            $angle = $m[1] + 0;
            if (strtolower($m[2])=='deg') {
                $angle = $angle;
            } elseif (strtolower($m[2])=='grad') {
                $angle *= (360/400);
            } elseif (strtolower($m[2])=='rad') {
                $angle = rad2deg($angle);
            }
            while ($angle < 0) {
                $angle += 360;
            }
            $angle = ($angle % 360);
        } elseif (trim($first[(count($first)-1)]) === "0") {
            $angle = 0;
        }
        if (preg_match('/left/i', $bgr[0])) {
            $startx = 0;
        } elseif (preg_match('/right/i', $bgr[0])) {
            $startx = 1;
        }
        if (preg_match('/top/i', $bgr[0])) {
            $starty = 1;
        } elseif (preg_match('/bottom/i', $bgr[0])) {
            $starty = 0;
        }
        // Check for %? ?% or %%
        if (preg_match('/(\d+)[%]/i', $first[0], $m)) {
            $startx = $m[1]/100;
        } elseif (!isset($startx) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i', $first[0], $m)) {
            $tmp = $this->mpdf->ConvertSize($m[1], $this->mpdf->w, $this->mpdf->FontSize, false);
            if ($tmp) {
                $startx = $m[1];
            }
        }
        if (isset($first[1]) && preg_match('/(\d+)[%]/i', $first[1], $m)) {
            $starty = 1 - ($m[1]/100);
        } elseif (!isset($starty) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i', $first[1], $m)) {
            $tmp = $this->mpdf->ConvertSize($m[1], $this->mpdf->w, $this->mpdf->FontSize, false);
            if ($tmp) {
                $starty = $m[1];
            }
        }
        if (isset($startx) && !isset($starty)) {
            $starty = 0.5;
        }
        if (!isset($startx) && isset($starty)) {
            $startx = 0.5;
        }
    }
            // If neither a <point> or <angle> is specified, i.e. the entire function consists of only <stop> values, the gradient axis starts from the top of the box and runs vertically downwards, ending at the bottom of the box.
    else {	// default values T2B
        $starty = 1;
        $startx = 0.5;
        $endy = 0;
        $endx = 0.5;
    }
            $coords = array();
            if (!isset($startx)) {
                $startx = false;
            }
            if (!isset($starty)) {
                $starty = false;
            }
            if (!isset($endx)) {
                $endx = false;
            }
            if (!isset($endy)) {
                $endy = false;
            }
            if (!isset($angle)) {
                $angle = false;
            }
            $g['coords'] = array($startx ,$starty ,$endx ,$endy, $angle, $repeat );
            $g['stops'] = array();
            for ($i=$startStops;$i<count($bgr);$i++) {
                $stop = array();
                // parse stops
                $el = preg_split('/\s+/', trim($bgr[$i]));
                // mPDF 5.3.74
                $col = $this->mpdf->ConvertColor($el[0]);
                if ($col) {
                    $stop['col'] = $col;
                } else {
                    $stop['col'] = $col = $this->mpdf->ConvertColor(255);
                }
                if ($col{0}==1) {
                    $g['colorspace'] = 'Gray';
                } elseif ($col{0}==4 || $col{0}==6) {
                    $g['colorspace'] = 'CMYK';
                }
                if ($col{0}==5) {
                    $stop['opacity'] = ord($col{4})/100;
                }	// transparency from rgba()
        elseif ($col{0}==6) {
            $stop['opacity'] = ord($col{5})/100;
        }	// transparency from cmyka()
        elseif ($col{0}==1 && $col{2}==1) {
            $stop['opacity'] = ord($col{3})/100;
        }	// transparency converted from rgba or cmyka()

        if (isset($el[1]) && preg_match('/(\d+)[%]/', $el[1], $m)) {
            $stop['offset'] = $m[1]/100;
            if ($stop['offset']>1) {
                unset($stop['offset']);
            }
        } elseif (isset($el[1]) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i', $el[1], $m)) {
            $tmp = $this->mpdf->ConvertSize($m[1], $this->mpdf->w, $this->mpdf->FontSize, false);
            if ($tmp) {
                $stop['offset'] = $m[1];
            }
        }
                $g['stops'][] = $stop;
            }
            if (count($g['stops'])) {
                return $g;
            }
        } elseif (preg_match('/radial-gradient\((.*)\)/', $bg, $m)) {
            $g = array();
            $g['type'] = 3;
            $g['colorspace'] = 'RGB';
            $g['extend'] = array('true','true');
            $v = trim($m[1]);
            // Change commas inside e.g. rgb(x,x,x)
            while (preg_match('/(\([^\)]*?),/', $v)) {
                $v = preg_replace('/(\([^\)]*?),/', '\\1@', $v);
            }
            // Remove spaces inside e.g. rgb(x, x, x)
            while (preg_match('/(\([^\)]*?)[ ]/', $v)) {
                $v = preg_replace('/(\([^\)]*?)[ ]/', '\\1', $v);
            }
            $bgr = preg_split('/\s*,\s*/', $v);
            for ($i=0;$i<count($bgr);$i++) {
                $bgr[$i] = preg_replace('/@/', ',', $bgr[$i]);
            }

            // Is first part $bgr[0] a valid point/angle?
            $startStops = 0;
            $pos_angle = false;
            $shape_size = false;
            $first = preg_split('/\s+/', trim($bgr[0]));
            $checkCol = $this->mpdf->ConvertColor($first[0]);
            if (preg_match('/(left|center|right|bottom|top|deg|grad|rad)/i', $bgr[0]) && !preg_match('/(<#|rgb|rgba|hsl|hsla)/i', $bgr[0])) {
                $startStops=1;
                $pos_angle = $bgr[0];
            } elseif (trim($first[(count($first)-1)]) === "0") {
                $startStops=1;
                $pos_angle = $bgr[0];
            } elseif (preg_match('/(circle|ellipse|closest-side|closest-corner|farthest-side|farthest-corner|contain|cover)/i', $bgr[0])) {
                $startStops=1;
                $shape_size = $bgr[0];
            } elseif (!$checkCol) {
                $startStops=1;
                $pos_angle = $bgr[0];
            }
            if (preg_match('/(circle|ellipse|closest-side|closest-corner|farthest-side|farthest-corner|contain|cover)/i', $bgr[1])) {
                $startStops=2;
                $shape_size = $bgr[1];
            }

            // If valid point/angle?
    if ($pos_angle) {	// default values
        // [<point> || <angle>,] = [<% em px left center right bottom top> || <deg grad rad 0>,]
        if (preg_match('/left/i', $pos_angle)) {
            $startx = 0;
        } elseif (preg_match('/right/i', $pos_angle)) {
            $startx = 1;
        }
        if (preg_match('/top/i', $pos_angle)) {
            $starty = 1;
        } elseif (preg_match('/bottom/i', $pos_angle)) {
            $starty = 0;
        }
        // Check for %? ?% or %%
        if (preg_match('/(\d+)[%]/i', $first[0], $m)) {
            $startx = $m[1]/100;
        } elseif (!isset($startx) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i', $first[0], $m)) {
            $tmp = $this->mpdf->ConvertSize($m[1], $this->mpdf->w, $this->mpdf->FontSize, false);
            if ($tmp) {
                $startx = $m[1];
            }
        }
        if (isset($first[1]) && preg_match('/(\d+)[%]/i', $first[1], $m)) {
            $starty = 1 - ($m[1]/100);
        } elseif (!isset($starty) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i', $first[1], $m)) {
            $tmp = $this->mpdf->ConvertSize($m[1], $this->mpdf->w, $this->mpdf->FontSize, false);
            if ($tmp) {
                $starty = $m[1];
            }
        }

        /*
                // ?? Angle has no effect in radial gradient (does not exist in CSS3 spec.)
                if (preg_match('/([\-]*[0-9\.]+)(deg|grad|rad)/i',$pos_angle,$m)) {
                    $angle = $m[1] + 0;
                    if (strtolower($m[2])=='deg') { $angle = $angle; }
                    else if (strtolower($m[2])=='grad') { $angle *= (360/400); }
                    else if (strtolower($m[2])=='rad') { $angle = rad2deg($angle); }
                    while($angle < 0) { $angle += 360; }
                    $angle = ($angle % 360);
                }
        */
        if (!isset($starty)) {
            $starty = 0.5;
        }
        if (!isset($startx)) {
            $startx = 0.5;
        }
    }
            // If neither a <point> or <angle> is specified, i.e. the entire function consists of only <stop> values, the gradient axis starts from the top of the box and runs vertically downwards, ending at the bottom of the box.
    else {	// default values Center
        $starty = 0.5;
        $startx = 0.5;
        $endy = 0.5;
        $endx = 0.5;
    }

            // If valid shape/size?
    $shape = 'ellipse';	// default
    $size = 'farthest-corner';	// default
    if ($shape_size) {	// default values
        if (preg_match('/(circle|ellipse)/i', $shape_size, $m)) {
            $shape = $m[1];
        }
        if (preg_match('/(closest-side|closest-corner|farthest-side|farthest-corner|contain|cover)/i', $shape_size, $m)) {
            $size = $m[1];
            if ($size=='contain') {
                $size = 'closest-side';
            } elseif ($size=='cover') {
                $size = 'farthest-corner';
            }
        }
    }

            $coords = array();
            if (!isset($startx)) {
                $startx = false;
            }
            if (!isset($starty)) {
                $starty = false;
            }
            if (!isset($endx)) {
                $endx = false;
            }
            if (!isset($endy)) {
                $endy = false;
            }
            if (!isset($radius)) {
                $radius = false;
            }
            if (!isset($angle)) {
                $angle = 0;
            }
            $g['coords'] = array($startx ,$starty ,$endx ,$endy, $radius, $angle, $shape, $size, $repeat );

            $g['stops'] = array();
            for ($i=$startStops;$i<count($bgr);$i++) {
                $stop = array();
                // parse stops
                $el = preg_split('/\s+/', trim($bgr[$i]));
                // mPDF 5.3.74
                $col = $this->mpdf->ConvertColor($el[0]);
                if ($col) {
                    $stop['col'] = $col;
                } else {
                    $stop['col'] = $col = $this->mpdf->ConvertColor(255);
                }
                if ($col{0}==1) {
                    $g['colorspace'] = 'Gray';
                } elseif ($col{0}==4 || $col{0}==6) {
                    $g['colorspace'] = 'CMYK';
                }
                if ($col{0}==5) {
                    $stop['opacity'] = ord($col{4})/100;
                }	// transparency from rgba()
        elseif ($col{0}==6) {
            $stop['opacity'] = ord($col{5})/100;
        }	// transparency from cmyka()
        elseif ($col{0}==1 && $col{2}==1) {
            $stop['opacity'] = ord($col{3})/100;
        }	// transparency converted from rgba or cmyka()

        if (isset($el[1]) && preg_match('/(\d+)[%]/', $el[1], $m)) {
            $stop['offset'] = $m[1]/100;
            if ($stop['offset']>1) {
                unset($stop['offset']);
            }
        } elseif (isset($el[1]) && preg_match('/([0-9.]+(px|em|ex|pc|pt|cm|mm|in))/i', $el[1], $m)) {
            $tmp = $this->mpdf->ConvertSize($m[1], $this->mpdf->w, $this->mpdf->FontSize, false);
            $stop['offset'] = $el[1];
        }
                $g['stops'][] = $stop;
            }
            if (count($g['stops'])) {
                return $g;
            }
        }
        return array();
    }

    public function parseBackgroundGradient($bg)
    {
        // background-gradient: linear #00FFFF #FFFF00 0 0.5 1 0.5;  or
        // background-gradient: radial #00FFFF #FFFF00 0.5 0.5 1 1 1.2;

        $v = trim($bg);
        $bgr = preg_split('/\s+/', $v);
        $g = array();
        if (count($bgr)> 6) {
            if (strtoupper(substr($bgr[0], 0, 1)) == 'L' && count($bgr)==7) {  // linear
                $g['type'] = 2;
                //$coords = array(0,0,1,1 );	// 0 0 1 0 or 0 1 1 1 is L 2 R; 1,1,0,1 is R2L; 1,1,1,0 is T2B; 1,0,1,1 is B2T
                // Linear: $coords - array of the form (x1, y1, x2, y2) which defines the gradient vector (see linear_gradient_coords.jpg).
                //    The default value is from left to right (x1=0, y1=0, x2=1, y2=0).
                $g['coords'] = array($bgr[3], $bgr[4], $bgr[5], $bgr[6]);
            } elseif (count($bgr)==8) {	// radial
                $g['type'] = 3;
                // Radial: $coords - array of the form (fx, fy, cx, cy, r) where (fx, fy) is the starting point of the gradient with color1,
                //    (cx, cy) is the center of the circle with color2, and r is the radius of the circle (see radial_gradient_coords.jpg).
                //    (fx, fy) should be inside the circle, otherwise some areas will not be defined
                $g['coords'] = array($bgr[3], $bgr[4], $bgr[5], $bgr[6], $bgr[7]);
            }
            $g['colorspace'] = 'RGB';
            // mPDF 5.3.74
            $cor = $this->mpdf->ConvertColor($bgr[1]);
            if ($cor{0}==1) {
                $g['colorspace'] = 'Gray';
            } elseif ($cor{0}==4 || $cor{0}==6) {
                $g['colorspace'] = 'CMYK';
            }
            if ($cor) {
                $g['col'] = $cor;
            } else {
                $g['col'] = $this->mpdf->ConvertColor(255);
            }
            $cor = $this->mpdf->ConvertColor($bgr[2]);
            if ($cor) {
                $g['col2'] = $cor;
            } else {
                $g['col2'] = $this->mpdf->ConvertColor(255);
            }
            $g['extend'] = array('true','true');
            $g['stops'] = array(array('col'=>$g['col'], 'opacity'=>1, 'offset'=>0), array('col'=>$g['col2'], 'opacity'=>1, 'offset'=>1));
            return $g;
        }
        return false;
    }
}
